遥感卫星随遇接入互联网星座和在轨智能处理

doi:10.11959/j.issn.1000-0801.2022075

Abstract

Abstract:

The low earth orbit (LEO) satellite Internet constellation is a hot spot in current global research.And it is highly anticipated that the LEO satellite Internet constellation supports random access to remote sensing satellites and direct on-orbit information processing.However, due to the different orbital heights, the difficult access problems of the bidirectional highly dynamic heterogeneous constellation will be caused.Firstly, the random access scenario under different orbit characteristics and satellite numbers of LEO satellite Internet constellation was set up, and the impact of the spatiotemporal discontinuous visibility and Doppler frequency shift on the remote sensing satellite access performance was focused on.Secondly, based on the characteristics of the random access scenario, the process of on-orbit processing tasks with different delays and the allocation of satellite-ground functions were analyzed.Finally, the problems existing in the current on-orbit intelligent processing algorithm and the focus of future research were expounded, so as to provide reliable theoretical support for the development and applications of LEO satellite Internet constellation and remote sensing satellites in the future.

Key words: LEO satellite internet constellation, remote sensing satellite, random access, coverage discontinuity, on-orbit intelligent processing

CLC Number:

TP393

Xiaoyu CHANG, Weijia ZHANG, Xudong1 LI, Xiaonan ZHANG, Gang WANG, Gang JIA. Study on remote sensing satellites random access to internet constellation and on-orbit intelligent processing[J]. Telecommunications Science, 2022, 38(4): 59-69.

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References 34

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	场景	参数
低轨卫星互联网星座参数	轨道	极轨　　极轨　　倾斜轨道
	卫星数量	72颗　　144颗　　216颗
	卫星倾角	86.5°　　86.5°　　50°
	卫星高度	1 100 km
	卫星对地波束	±55°扫描
遥感卫星（用户星）参数	卫星最小通信仰角	25.90°
	卫星高度	500 km
	轨道倾角	45°、60°、98°（太阳同步轨道）
	最小接入时长	120 s

对比项	航天器轨道类型
对比项	45°倾角	60°倾角	太阳同步轨道
中断次数	132次	144次	147次
最长可见时长	429 s	686 s	2 233 s
一天总可见时长	7 h 25 min	8 h 33 min	10 h 59 min
接入总时长占比	30.94%	35.65%	45.75%

对比项	航天器轨道类型
对比项	45°倾角	60°倾角	太阳同步轨道
中断次数	238次	187次	168次
最长可见时长	913 s	1 879 s	3 068 s
一天总可见时长	14 h 44 min	16 h 20 min	16 h 58 min
接入总时长占比	61.42%	68.06%	70.66%

对比项	航天器轨道类型
对比项	45°倾角	60°倾角	太阳同步轨道
中断次数	79次	99次	131次
最长可见时长	4 755 s	2 474 s	1 068 s
一天总可见时长	21 h 11 min	18 h 2 min	12 h 54 min
接入总时长占比	88.29%	75.15%	53.75%

	在轨算法	结果产品
遥感卫星及互联网星座	● 预处理算法：辐射校正、系统几何校正、粗正射校正、图像切片	时效性要求高、精度要求低的任务：L1 级产品、L2 级产品、目标结果产品、关键信息产品
	● 目标检测：YOLOv3-tiny、YOLOv4-tiny、YOLOS、mobilenet_ssd、MobileNet、NanoDet等轻量化模型
	● 语义分割：轻量级 Deeplab-v3、LU-Net、CBR-ENet、SKASNet、LRUNet、MUNet等轻量化模型
	● 后处理：图像拼接算法、栅格矢量转化算法
地面中心	● 预处理算法：精确几何校正、精确正射校正、影像相对配准、图像切片	精度要求高的任务：L2 级产品、目标结果产品、关键信息产品、精确专题产品
	● 目标检测：YOLOv4、YOLOv5、FasterR-CNN、SSD等模型
	● 语义分割：Deeplab-v3、HRNetv3、UNet、PSPNet、RefineNet等模型
	● 变化检测：SECDNet、ESCNet、DTCDSCN、STANet等模型
	● 后处理：图像拼接算法、栅格矢量转化算法

Study on remote sensing satellites random access to internet constellation and on-orbit intelligent processing

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